diff --git a/CLAUDE.md b/CLAUDE.md
index afb00d7..a9588b1 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -2,6 +2,10 @@
 
 Federated content-addressed DAG execution engine for distributed media processing with ActivityPub ownership and provenance tracking.
 
+## Deployment
+
+- **Do NOT push** until explicitly told to. Pushes reload code to dev automatically.
+
 ## Project Structure
 
 ```
@@ -54,6 +58,9 @@ docker build -f l2/Dockerfile -t l2-server:latest .
 - **Celery Tasks**: In `l1/tasks/`, decorated with `@app.task`
 - **S-Expression Effects**: Composable effect language in `l1/sexp_effects/`
 - **Storage**: Local filesystem, S3, or IPFS backends (`storage_providers.py`)
+- **Inter-Service Reads**: `fetch_data()` → GET `/internal/data/{query}` (HMAC-signed)
+- **Inter-Service Actions**: `call_action()` → POST `/internal/actions/{name}` (HMAC-signed)
+- **Inter-Service AP Inbox**: `send_internal_activity()` → POST `/internal/inbox` (HMAC-signed, AP-shaped activities for cross-service writes with denormalized data)
 
 ## Auth
 
diff --git a/cart/alembic/versions/0002_denormalize_product_data.py b/cart/alembic/versions/0002_denormalize_product_data.py
new file mode 100644
index 0000000..d9396b0
--- /dev/null
+++ b/cart/alembic/versions/0002_denormalize_product_data.py
@@ -0,0 +1,48 @@
+"""Denormalize product and marketplace data onto cart_items and order_items.
+
+Revision ID: cart_0002
+Revises: cart_0001
+Create Date: 2026-02-26
+"""
+
+import sqlalchemy as sa
+from alembic import op
+
+revision = "cart_0002"
+down_revision = "cart_0001"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # -- cart_items: denormalized product data --
+    op.add_column("cart_items", sa.Column("product_title", sa.String(512), nullable=True))
+    op.add_column("cart_items", sa.Column("product_slug", sa.String(512), nullable=True))
+    op.add_column("cart_items", sa.Column("product_image", sa.Text, nullable=True))
+    op.add_column("cart_items", sa.Column("product_brand", sa.String(255), nullable=True))
+    op.add_column("cart_items", sa.Column("product_regular_price", sa.Numeric(12, 2), nullable=True))
+    op.add_column("cart_items", sa.Column("product_special_price", sa.Numeric(12, 2), nullable=True))
+    op.add_column("cart_items", sa.Column("product_price_currency", sa.String(16), nullable=True))
+
+    # -- cart_items: denormalized marketplace data --
+    op.add_column("cart_items", sa.Column("market_place_name", sa.String(255), nullable=True))
+    op.add_column("cart_items", sa.Column("market_place_container_id", sa.Integer, nullable=True))
+
+    # -- order_items: denormalized product fields --
+    op.add_column("order_items", sa.Column("product_slug", sa.String(512), nullable=True))
+    op.add_column("order_items", sa.Column("product_image", sa.Text, nullable=True))
+
+
+def downgrade():
+    op.drop_column("order_items", "product_image")
+    op.drop_column("order_items", "product_slug")
+
+    op.drop_column("cart_items", "market_place_container_id")
+    op.drop_column("cart_items", "market_place_name")
+    op.drop_column("cart_items", "product_price_currency")
+    op.drop_column("cart_items", "product_special_price")
+    op.drop_column("cart_items", "product_regular_price")
+    op.drop_column("cart_items", "product_brand")
+    op.drop_column("cart_items", "product_image")
+    op.drop_column("cart_items", "product_slug")
+    op.drop_column("cart_items", "product_title")
diff --git a/cart/app.py b/cart/app.py
index f02ffc3..8643f7b 100644
--- a/cart/app.py
+++ b/cart/app.py
@@ -19,6 +19,7 @@ from bp import (
     register_fragments,
     register_actions,
     register_data,
+    register_inbox,
 )
 from bp.cart.services import (
     get_cart,
@@ -143,6 +144,7 @@ def create_app() -> "Quart":
     app.register_blueprint(register_fragments())
     app.register_blueprint(register_actions())
     app.register_blueprint(register_data())
+    app.register_blueprint(register_inbox())
 
     # --- Page slug hydration (follows events/market app pattern) ---
 
diff --git a/cart/bp/__init__.py b/cart/bp/__init__.py
index 43a64c1..72d4f84 100644
--- a/cart/bp/__init__.py
+++ b/cart/bp/__init__.py
@@ -6,3 +6,4 @@ from .orders.routes import register as register_orders
 from .fragments import register_fragments
 from .actions import register_actions
 from .data import register_data
+from .inbox import register_inbox
diff --git a/cart/bp/cart/global_routes.py b/cart/bp/cart/global_routes.py
index ad528af..dd24665 100644
--- a/cart/bp/cart/global_routes.py
+++ b/cart/bp/cart/global_routes.py
@@ -7,7 +7,6 @@ from sqlalchemy import select
 
 from shared.models.market import CartItem
 from shared.models.order import Order
-from shared.models.market_place import MarketPlace
 from shared.infrastructure.actions import call_action
 from .services import (
     current_cart_identity,
@@ -265,16 +264,14 @@ def register(url_prefix: str) -> Blueprint:
                                     required=False) if raw_pc else None
             if post:
                 g.page_slug = post["slug"]
-                result = await g.s.execute(
-                    select(MarketPlace).where(
-                        MarketPlace.container_type == "page",
-                        MarketPlace.container_id == post["id"],
-                        MarketPlace.deleted_at.is_(None),
-                    ).limit(1)
-                )
-                mp = result.scalar_one_or_none()
-                if mp:
-                    g.market_slug = mp.slug
+                # Fetch marketplace slug from market service
+                mps = await fetch_data(
+                    "market", "marketplaces-for-container",
+                    params={"type": "page", "id": post["id"]},
+                    required=False,
+                ) or []
+                if mps:
+                    g.market_slug = mps[0].get("slug")
 
         if order.sumup_checkout_id:
             try:
diff --git a/cart/bp/cart/services/checkout.py b/cart/bp/cart/services/checkout.py
index 7d9f3e9..1063175 100644
--- a/cart/bp/cart/services/checkout.py
+++ b/cart/bp/cart/services/checkout.py
@@ -9,9 +9,8 @@ from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import selectinload
 
-from shared.models.market import Product, CartItem
+from shared.models.market import CartItem
 from shared.models.order import Order, OrderItem
-from shared.models.market_place import MarketPlace
 from shared.config import config
 from shared.contracts.dtos import CalendarEntryDTO
 from shared.events import emit_activity
@@ -24,17 +23,24 @@ async def find_or_create_cart_item(
     product_id: int,
     user_id: Optional[int],
     session_id: Optional[str],
+    *,
+    product_title: str | None = None,
+    product_slug: str | None = None,
+    product_image: str | None = None,
+    product_brand: str | None = None,
+    product_regular_price: float | None = None,
+    product_special_price: float | None = None,
+    product_price_currency: str | None = None,
+    market_place_id: int | None = None,
+    market_place_name: str | None = None,
+    market_place_container_id: int | None = None,
 ) -> Optional[CartItem]:
     """
     Find an existing cart item for this product/identity, or create a new one.
-    Returns None if the product doesn't exist.
+    Returns None if product data is missing.
     Increments quantity if item already exists.
     """
-    # Make sure product exists
-    product = await session.scalar(
-        select(Product).where(Product.id == product_id)
-    )
-    if not product:
+    if not product_id:
         return None
 
     # Look for existing cart item
@@ -56,8 +62,18 @@ async def find_or_create_cart_item(
         cart_item = CartItem(
             user_id=user_id,
             session_id=session_id,
-            product_id=product.id,
+            product_id=product_id,
             quantity=1,
+            market_place_id=market_place_id,
+            product_title=product_title,
+            product_slug=product_slug,
+            product_image=product_image,
+            product_brand=product_brand,
+            product_regular_price=product_regular_price,
+            product_special_price=product_special_price,
+            product_price_currency=product_price_currency,
+            market_place_name=market_place_name,
+            market_place_container_id=market_place_container_id,
         )
         session.add(cart_item)
         return cart_item
@@ -76,12 +92,10 @@ async def resolve_page_config(
     """
     post_ids: set[int] = set()
 
-    # From cart items via market_place
+    # From cart items via denormalized market_place_container_id
     for ci in cart:
-        if ci.market_place_id:
-            mp = await session.get(MarketPlace, ci.market_place_id)
-            if mp:
-                post_ids.add(mp.container_id)
+        if ci.market_place_container_id:
+            post_ids.add(ci.market_place_container_id)
 
     # From calendar entries via calendar
     for entry in calendar_entries:
@@ -130,8 +144,7 @@ async def create_order_from_cart(
     cart_total = product_total + calendar_total + ticket_total
 
     # Determine currency from first product
-    first_product = cart[0].product if cart else None
-    currency = (first_product.regular_price_currency if first_product else None) or "GBP"
+    currency = (cart[0].product_price_currency if cart else None) or "GBP"
 
     # Create order
     order = Order(
@@ -146,11 +159,13 @@ async def create_order_from_cart(
 
     # Create order items from cart
     for ci in cart:
-        price = ci.product.special_price or ci.product.regular_price or 0
+        price = ci.product_special_price or ci.product_regular_price or 0
         oi = OrderItem(
             order=order,
-            product_id=ci.product.id,
-            product_title=ci.product.title,
+            product_id=ci.product_id,
+            product_title=ci.product_title,
+            product_slug=ci.product_slug,
+            product_image=ci.product_image,
             quantity=ci.quantity,
             unit_price=price,
             currency=currency,
@@ -188,7 +203,7 @@ async def create_order_from_cart(
 
 def build_sumup_description(cart: list[CartItem], order_id: int, *, ticket_count: int = 0) -> str:
     """Build a human-readable description for SumUp checkout."""
-    titles = [ci.product.title for ci in cart if ci.product and ci.product.title]
+    titles = [ci.product_title for ci in cart if ci.product_title]
     item_count = sum(ci.quantity for ci in cart)
 
     parts = []
@@ -240,11 +255,11 @@ def validate_webhook_secret(token: Optional[str]) -> bool:
 
 
 async def get_order_with_details(session: AsyncSession, order_id: int) -> Optional[Order]:
-    """Fetch an order with items and calendar entries eagerly loaded."""
+    """Fetch an order with items eagerly loaded."""
     result = await session.execute(
         select(Order)
         .options(
-            selectinload(Order.items).selectinload(OrderItem.product),
+            selectinload(Order.items),
         )
         .where(Order.id == order_id)
     )
diff --git a/cart/bp/cart/services/clear_cart_for_order.py b/cart/bp/cart/services/clear_cart_for_order.py
index 3643839..11736ee 100644
--- a/cart/bp/cart/services/clear_cart_for_order.py
+++ b/cart/bp/cart/services/clear_cart_for_order.py
@@ -1,7 +1,6 @@
-from sqlalchemy import update, func, select
+from sqlalchemy import update, func
 
 from shared.models.market import CartItem
-from shared.models.market_place import MarketPlace
 from shared.models.order import Order
 
 
@@ -23,12 +22,7 @@ async def clear_cart_for_order(session, order: Order, *, page_post_id: int | Non
         return
 
     if page_post_id is not None:
-        mp_ids = select(MarketPlace.id).where(
-            MarketPlace.container_type == "page",
-            MarketPlace.container_id == page_post_id,
-            MarketPlace.deleted_at.is_(None),
-        ).scalar_subquery()
-        filters.append(CartItem.market_place_id.in_(mp_ids))
+        filters.append(CartItem.market_place_container_id == page_post_id)
 
     await session.execute(
         update(CartItem)
diff --git a/cart/bp/cart/services/get_cart.py b/cart/bp/cart/services/get_cart.py
index ad1c0ce..ef50025 100644
--- a/cart/bp/cart/services/get_cart.py
+++ b/cart/bp/cart/services/get_cart.py
@@ -1,25 +1,55 @@
+from types import SimpleNamespace
+
 from sqlalchemy import select
-from sqlalchemy.orm import selectinload
 
 from shared.models.market import CartItem
 from .identity import current_cart_identity
 
-async def get_cart(session):
-  ident = current_cart_identity()
-  
-  filters = [CartItem.deleted_at.is_(None)]
-  if ident["user_id"] is not None:
-      filters.append(CartItem.user_id == ident["user_id"])
-  else:
-      filters.append(CartItem.session_id == ident["session_id"])
 
-  result = await session.execute(
-      select(CartItem)
-      .where(*filters)
-      .order_by(CartItem.created_at.desc())
-      .options(
-          selectinload(CartItem.product),
-          selectinload(CartItem.market_place),
-      )
-  )
-  return result.scalars().all()
+def _attach_product_namespace(ci: CartItem) -> None:
+    """Build a SimpleNamespace 'product' from denormalized columns for template compat."""
+    ci.product = SimpleNamespace(
+        id=ci.product_id,
+        title=ci.product_title,
+        slug=ci.product_slug,
+        image=ci.product_image,
+        brand=ci.product_brand,
+        regular_price=ci.product_regular_price,
+        special_price=ci.product_special_price,
+        regular_price_currency=ci.product_price_currency,
+    )
+
+
+def _attach_market_place_namespace(ci: CartItem) -> None:
+    """Build a SimpleNamespace 'market_place' from denormalized columns."""
+    if ci.market_place_id:
+        ci.market_place = SimpleNamespace(
+            id=ci.market_place_id,
+            name=ci.market_place_name,
+            container_id=ci.market_place_container_id,
+        )
+    else:
+        ci.market_place = None
+
+
+async def get_cart(session):
+    ident = current_cart_identity()
+
+    filters = [CartItem.deleted_at.is_(None)]
+    if ident["user_id"] is not None:
+        filters.append(CartItem.user_id == ident["user_id"])
+    else:
+        filters.append(CartItem.session_id == ident["session_id"])
+
+    result = await session.execute(
+        select(CartItem)
+        .where(*filters)
+        .order_by(CartItem.created_at.desc())
+    )
+    items = list(result.scalars().all())
+
+    for ci in items:
+        _attach_product_namespace(ci)
+        _attach_market_place_namespace(ci)
+
+    return items
diff --git a/cart/bp/cart/services/page_cart.py b/cart/bp/cart/services/page_cart.py
index afb92cd..cf20f8a 100644
--- a/cart/bp/cart/services/page_cart.py
+++ b/cart/bp/cart/services/page_cart.py
@@ -2,7 +2,7 @@
 Page-scoped cart queries.
 
 Groups cart items and calendar entries by their owning page (Post),
-determined via CartItem.market_place.container_id and CalendarEntry.calendar.container_id
+determined via CartItem.market_place_container_id
 (where container_type == "page").
 """
 from __future__ import annotations
@@ -12,24 +12,21 @@ from collections import defaultdict
 from types import SimpleNamespace
 
 from sqlalchemy import select
-from sqlalchemy.orm import selectinload
 
 from shared.models.market import CartItem
-from shared.models.market_place import MarketPlace
 from shared.infrastructure.data_client import fetch_data
 from shared.contracts.dtos import CalendarEntryDTO, TicketDTO, PostDTO, dto_from_dict
 from .identity import current_cart_identity
+from .get_cart import _attach_product_namespace, _attach_market_place_namespace
 
 
 async def get_cart_for_page(session, post_id: int) -> list[CartItem]:
-    """Return cart items scoped to a specific page (via MarketPlace.container_id)."""
+    """Return cart items scoped to a specific page (via denormalized market_place_container_id)."""
     ident = current_cart_identity()
 
     filters = [
         CartItem.deleted_at.is_(None),
-        MarketPlace.container_type == "page",
-        MarketPlace.container_id == post_id,
-        MarketPlace.deleted_at.is_(None),
+        CartItem.market_place_container_id == post_id,
     ]
     if ident["user_id"] is not None:
         filters.append(CartItem.user_id == ident["user_id"])
@@ -38,15 +35,16 @@ async def get_cart_for_page(session, post_id: int) -> list[CartItem]:
 
     result = await session.execute(
         select(CartItem)
-        .join(MarketPlace, CartItem.market_place_id == MarketPlace.id)
         .where(*filters)
         .order_by(CartItem.created_at.desc())
-        .options(
-            selectinload(CartItem.product),
-            selectinload(CartItem.market_place),
-        )
     )
-    return result.scalars().all()
+    items = list(result.scalars().all())
+
+    for ci in items:
+        _attach_product_namespace(ci)
+        _attach_market_place_namespace(ci)
+
+    return items
 
 
 async def get_calendar_entries_for_page(session, post_id: int):
diff --git a/cart/bp/cart/services/total.py b/cart/bp/cart/services/total.py
index 8dcdaf9..151fa06 100644
--- a/cart/bp/cart/services/total.py
+++ b/cart/bp/cart/services/total.py
@@ -4,10 +4,9 @@ from decimal import Decimal
 def total(cart):
     return sum(
         (
-            Decimal(str(item.product.special_price or item.product.regular_price))
+            Decimal(str(item.product_special_price or item.product_regular_price))
             * item.quantity
         )
         for item in cart
-        if (item.product.special_price or item.product.regular_price) is not None
+        if (item.product_special_price or item.product_regular_price) is not None
     )
-      
\ No newline at end of file
diff --git a/cart/bp/data/routes.py b/cart/bp/data/routes.py
index af5fce7..d401c15 100644
--- a/cart/bp/data/routes.py
+++ b/cart/bp/data/routes.py
@@ -83,7 +83,6 @@ def register() -> Blueprint:
     # --- cart-items (product slugs + quantities for template rendering) ---
     async def _cart_items():
         from sqlalchemy import select
-        from sqlalchemy.orm import selectinload
         from shared.models.market import CartItem
 
         user_id = request.args.get("user_id", type=int)
@@ -98,13 +97,13 @@ def register() -> Blueprint:
             return []
 
         result = await g.s.execute(
-            select(CartItem).where(*filters).options(selectinload(CartItem.product))
+            select(CartItem).where(*filters)
         )
         items = result.scalars().all()
         return [
             {
                 "product_id": item.product_id,
-                "product_slug": item.product.slug if item.product else None,
+                "product_slug": item.product_slug,
                 "quantity": item.quantity,
             }
             for item in items
diff --git a/cart/bp/inbox/__init__.py b/cart/bp/inbox/__init__.py
new file mode 100644
index 0000000..16e431f
--- /dev/null
+++ b/cart/bp/inbox/__init__.py
@@ -0,0 +1 @@
+from .routes import register as register_inbox
diff --git a/cart/bp/inbox/routes.py b/cart/bp/inbox/routes.py
new file mode 100644
index 0000000..9fa9b67
--- /dev/null
+++ b/cart/bp/inbox/routes.py
@@ -0,0 +1,161 @@
+"""Cart internal inbox endpoint.
+
+Receives AP-shaped activities from other services via HMAC-authenticated
+POST to ``/internal/inbox``. Routes to handlers registered via the
+internal inbox dispatch infrastructure.
+"""
+from __future__ import annotations
+
+import logging
+from datetime import datetime, timezone
+
+from quart import Blueprint, g, jsonify, request
+from sqlalchemy import select
+
+from shared.infrastructure.internal_inbox import dispatch_internal_activity, register_internal_handler
+from shared.infrastructure.internal_inbox_client import INBOX_HEADER
+from shared.models.market import CartItem
+
+log = logging.getLogger(__name__)
+
+
+def register() -> Blueprint:
+    bp = Blueprint("inbox", __name__, url_prefix="/internal/inbox")
+
+    @bp.before_request
+    async def _require_inbox_header():
+        if not request.headers.get(INBOX_HEADER):
+            return jsonify({"error": "forbidden"}), 403
+        from shared.infrastructure.internal_auth import validate_internal_request
+        if not validate_internal_request():
+            return jsonify({"error": "forbidden"}), 403
+
+    @bp.post("")
+    async def handle_inbox():
+        body = await request.get_json()
+        if not body:
+            return jsonify({"error": "empty body"}), 400
+        try:
+            result = await dispatch_internal_activity(g.s, body)
+            return jsonify(result)
+        except ValueError as exc:
+            return jsonify({"error": str(exc)}), 400
+        except Exception as exc:
+            log.exception("Internal inbox dispatch failed")
+            return jsonify({"error": str(exc)}), 500
+
+    # --- Handler: Add rose:CartItem ---
+    async def _handle_add_cart_item(session, body: dict) -> dict:
+        obj = body["object"]
+        user_id = obj.get("user_id")
+        session_id = obj.get("session_id")
+        product_id = obj["product_id"]
+        count = obj.get("quantity", 1)
+        market_place_id = obj.get("market_place_id")
+
+        # Look for existing cart item
+        filters = [
+            CartItem.deleted_at.is_(None),
+            CartItem.product_id == product_id,
+        ]
+        if user_id is not None:
+            filters.append(CartItem.user_id == user_id)
+        else:
+            filters.append(CartItem.session_id == session_id)
+
+        existing = await session.scalar(select(CartItem).where(*filters))
+
+        if existing:
+            if count > 0:
+                existing.quantity = count
+            else:
+                existing.deleted_at = datetime.now(timezone.utc)
+            ci = existing
+        else:
+            if count <= 0:
+                return {"ok": True, "action": "noop"}
+            ci = CartItem(
+                user_id=user_id,
+                session_id=session_id,
+                product_id=product_id,
+                quantity=count,
+                market_place_id=market_place_id,
+                # Denormalized product data
+                product_title=obj.get("product_title"),
+                product_slug=obj.get("product_slug"),
+                product_image=obj.get("product_image"),
+                product_brand=obj.get("product_brand"),
+                product_regular_price=obj.get("product_regular_price"),
+                product_special_price=obj.get("product_special_price"),
+                product_price_currency=obj.get("product_price_currency"),
+                # Denormalized marketplace data
+                market_place_name=obj.get("market_place_name"),
+                market_place_container_id=obj.get("market_place_container_id"),
+            )
+            session.add(ci)
+
+        await session.flush()
+        return {
+            "ok": True,
+            "cart_item_id": ci.id,
+            "quantity": ci.quantity,
+        }
+
+    register_internal_handler("Add", "rose:CartItem", _handle_add_cart_item)
+
+    # --- Handler: Remove rose:CartItem ---
+    async def _handle_remove_cart_item(session, body: dict) -> dict:
+        obj = body["object"]
+        user_id = obj.get("user_id")
+        session_id = obj.get("session_id")
+        product_id = obj["product_id"]
+
+        filters = [
+            CartItem.deleted_at.is_(None),
+            CartItem.product_id == product_id,
+        ]
+        if user_id is not None:
+            filters.append(CartItem.user_id == user_id)
+        else:
+            filters.append(CartItem.session_id == session_id)
+
+        existing = await session.scalar(select(CartItem).where(*filters))
+        if existing:
+            existing.deleted_at = datetime.now(timezone.utc)
+            await session.flush()
+
+        return {"ok": True}
+
+    register_internal_handler("Remove", "rose:CartItem", _handle_remove_cart_item)
+
+    # --- Handler: Update rose:CartItem ---
+    async def _handle_update_cart_item(session, body: dict) -> dict:
+        obj = body["object"]
+        user_id = obj.get("user_id")
+        session_id = obj.get("session_id")
+        product_id = obj["product_id"]
+        quantity = obj.get("quantity", 1)
+
+        filters = [
+            CartItem.deleted_at.is_(None),
+            CartItem.product_id == product_id,
+        ]
+        if user_id is not None:
+            filters.append(CartItem.user_id == user_id)
+        else:
+            filters.append(CartItem.session_id == session_id)
+
+        existing = await session.scalar(select(CartItem).where(*filters))
+        if existing:
+            if quantity <= 0:
+                existing.deleted_at = datetime.now(timezone.utc)
+            else:
+                existing.quantity = quantity
+            await session.flush()
+            return {"ok": True, "quantity": existing.quantity}
+
+        return {"ok": True, "action": "noop"}
+
+    register_internal_handler("Update", "rose:CartItem", _handle_update_cart_item)
+
+    return bp
diff --git a/cart/bp/order/routes.py b/cart/bp/order/routes.py
index 5432ce0..2452679 100644
--- a/cart/bp/order/routes.py
+++ b/cart/bp/order/routes.py
@@ -5,7 +5,6 @@ from sqlalchemy import select, func, or_, cast, String, exists
 from sqlalchemy.orm import selectinload
 
 
-from shared.models.market import Product
 from shared.models.order import Order, OrderItem
 from shared.browser.app.payments.sumup import create_checkout as sumup_create_checkout
 from shared.config import config
@@ -49,7 +48,7 @@ def register() -> Blueprint:
         result = await g.s.execute(
             select(Order)
             .options(
-                selectinload(Order.items).selectinload(OrderItem.product)
+                selectinload(Order.items)
             )
             .where(Order.id == order_id, owner)
         )
diff --git a/cart/bp/orders/routes.py b/cart/bp/orders/routes.py
index 2e1579b..a6fbd8a 100644
--- a/cart/bp/orders/routes.py
+++ b/cart/bp/orders/routes.py
@@ -5,7 +5,6 @@ from sqlalchemy import select, func, or_, cast, String, exists
 from sqlalchemy.orm import selectinload
 
 
-from shared.models.market import Product
 from shared.models.order import Order, OrderItem
 from shared.browser.app.payments.sumup import create_checkout as sumup_create_checkout
 from shared.config import config
@@ -86,16 +85,11 @@ def register(url_prefix: str) -> Blueprint:
                 exists(
                     select(1)
                     .select_from(OrderItem)
-                    .join(Product, Product.id == OrderItem.product_id)
                     .where(
                         OrderItem.order_id == Order.id,
                         or_(
                             OrderItem.product_title.ilike(term),
-                            Product.title.ilike(term),
-                            Product.description_short.ilike(term),
-                            Product.description_html.ilike(term),
-                            Product.slug.ilike(term),
-                            Product.brand.ilike(term),
+                            OrderItem.product_slug.ilike(term),
                         ),
                     )
                 )
diff --git a/cart/templates/_types/order/_items.html b/cart/templates/_types/order/_items.html
index 27b2a9f..92d674d 100644
--- a/cart/templates/_types/order/_items.html
+++ b/cart/templates/_types/order/_items.html
@@ -7,13 +7,13 @@
       <ul class="divide-y divide-stone-100 text-xs sm:text-sm">
         {% for item in order.items %}
           <li>
-            <a class="w-full py-2 flex gap-3" href="{{ market_product_url(item.product.slug) }}">
+            <a class="w-full py-2 flex gap-3" href="{{ market_product_url(item.product_slug) }}">
               {# Thumbnail #}
               <div class="w-12 h-12 sm:w-14 sm:h-14 rounded-md bg-stone-100 flex-shrink-0 overflow-hidden">
-                {% if item.product and item.product.image %}
+                {% if item.product_image %}
                   <img
-                    src="{{ item.product.image }}"
-                    alt="{{ item.product_title or item.product.title or 'Product image' }}"
+                    src="{{ item.product_image }}"
+                    alt="{{ item.product_title or 'Product image' }}"
                     class="w-full h-full object-contain object-center"
                     loading="lazy"
                     decoding="async"
@@ -29,7 +29,7 @@
               <div class="flex-1 flex justify-between gap-3">
                 <div>
                   <p class="font-medium">
-                    {{ item.product_title or (item.product and item.product.title) or 'Unknown product' }}
+                    {{ item.product_title or 'Unknown product' }}
                   </p>
                   <p class="text-[11px] text-stone-500">
                     Product ID: {{ item.product_id }}
diff --git a/market/bp/data/routes.py b/market/bp/data/routes.py
index a1e6bf7..a24b90b 100644
--- a/market/bp/data/routes.py
+++ b/market/bp/data/routes.py
@@ -76,4 +76,35 @@ def register() -> Blueprint:
 
     _handlers["products-by-ids"] = _products_by_ids
 
+    # --- marketplaces-by-ids ---
+    async def _marketplaces_by_ids():
+        """Return marketplace data for a list of IDs (comma-separated)."""
+        from sqlalchemy import select
+        from shared.models.market_place import MarketPlace
+
+        ids_raw = request.args.get("ids", "")
+        try:
+            ids = [int(x) for x in ids_raw.split(",") if x.strip()]
+        except ValueError:
+            return {"error": "ids must be comma-separated integers"}, 400
+        if not ids:
+            return []
+
+        rows = (await g.s.execute(
+            select(MarketPlace).where(MarketPlace.id.in_(ids))
+        )).scalars().all()
+
+        return [
+            {
+                "id": m.id,
+                "name": m.name,
+                "slug": m.slug,
+                "container_type": m.container_type,
+                "container_id": m.container_id,
+            }
+            for m in rows
+        ]
+
+    _handlers["marketplaces-by-ids"] = _marketplaces_by_ids
+
     return bp
diff --git a/market/bp/product/routes.py b/market/bp/product/routes.py
index 19e76c4..56d4c72 100644
--- a/market/bp/product/routes.py
+++ b/market/bp/product/routes.py
@@ -162,29 +162,25 @@ def register():
     
     
     from bp.cart.services.identity import current_cart_identity
-    #from bp.cart.routes import view_cart
-    from models.market import CartItem
     from quart import request, url_for
+    from shared.infrastructure.internal_inbox_client import send_internal_activity
+    from shared.infrastructure.data_client import fetch_data
 
     @bp.post("/cart/")
     @clear_cache(tag="browse", tag_scope="user")
     async def cart():
         slug = g.product_slug
-        # make sure product exists (we *allow* deleted_at != None later if you want)
-        product_id = await g.s.scalar(
-            select(Product.id).where(
+        # Load product from local db_market
+        product = await g.s.scalar(
+            select(Product).where(
                 Product.slug == slug,
                 Product.deleted_at.is_(None),
             )
         )
-
-        product = await g.s.scalar(
-            select(Product).where(Product.id == product_id)
-        )
         if not product:
             return await make_response("Product not found", 404)
 
-        # --- NEW: read `count` from body (JSON or form), default to 1 ---
+        # Read `count` from body (JSON or form), default to 1
         count = 1
         try:
             if request.is_json:
@@ -196,68 +192,72 @@ def register():
                 if "count" in form:
                     count = int(form["count"])
         except (ValueError, TypeError):
-            # if parsing fails, just fall back to 1
             count = 1
-        # --- END NEW ---
 
         ident = current_cart_identity()
+        market = getattr(g, "market", None)
 
-        # Load cart items for current user/session
-        from sqlalchemy.orm import selectinload
-        cart_filters = [CartItem.deleted_at.is_(None)]
-        if ident["user_id"] is not None:
-            cart_filters.append(CartItem.user_id == ident["user_id"])
-        else:
-            cart_filters.append(CartItem.session_id == ident["session_id"])
-        cart_result = await g.s.execute(
-            select(CartItem)
-            .where(*cart_filters)
-            .order_by(CartItem.created_at.desc())
-            .options(
-                selectinload(CartItem.product),
-                selectinload(CartItem.market_place),
+        # Build AP activity with denormalized product data
+        activity_type = "Add" if count > 0 else "Remove"
+        activity = {
+            "type": activity_type,
+            "object": {
+                "type": "rose:CartItem",
+                "user_id": ident["user_id"],
+                "session_id": ident["session_id"],
+                "product_id": product.id,
+                "quantity": count,
+                "market_place_id": market.id if market else None,
+                # Denormalized product data
+                "product_title": product.title,
+                "product_slug": product.slug,
+                "product_image": product.image,
+                "product_brand": product.brand,
+                "product_regular_price": str(product.regular_price) if product.regular_price is not None else None,
+                "product_special_price": str(product.special_price) if product.special_price is not None else None,
+                "product_price_currency": product.regular_price_currency,
+                # Denormalized marketplace data
+                "market_place_name": market.name if market else None,
+                "market_place_container_id": market.container_id if market else None,
+            },
+        }
+
+        await send_internal_activity("cart", activity)
+
+        # Fetch updated cart items from cart service for template rendering
+        raw_cart = await fetch_data(
+            "cart", "cart-items",
+            params={
+                k: v for k, v in {
+                    "user_id": ident["user_id"],
+                    "session_id": ident["session_id"],
+                }.items() if v is not None
+            },
+            required=False,
+        ) or []
+
+        # Build minimal cart list for template (product slug + quantity)
+        from types import SimpleNamespace
+        g.cart = [
+            SimpleNamespace(
+                product_id=ci["product_id"],
+                product=SimpleNamespace(slug=ci["product_slug"]),
+                quantity=ci["quantity"],
             )
-        )
-        g.cart = list(cart_result.scalars().all())
+            for ci in raw_cart
+        ]
 
-        ci = next(
-            (item for item in g.cart if item.product_id == product_id),
+        ci_ns = next(
+            (item for item in g.cart if item.product_id == product.id),
             None,
         )
 
-        # --- NEW: set quantity based on `count` ---
-        if ci:
-            if count > 0:
-                ci.quantity = count
-            else:
-                # count <= 0 → remove from cart entirely
-                ci.quantity=0
-                g.cart.remove(ci)
-                await g.s.delete(ci)
-
-        else:
-            if count > 0:
-                ci = CartItem(
-                    user_id=ident["user_id"],
-                    session_id=ident["session_id"],
-                    product_id=product.id,
-                    product=product,
-                    quantity=count,
-                    market_place_id=getattr(g, "market", None) and g.market.id,
-                )
-                g.cart.append(ci)
-                g.s.add(ci)
-            # if count <= 0 and no existing item, do nothing
-        # --- END NEW ---
-
-        # no explicit commit; your session middleware should handle it
-
         # htmx response: OOB-swap mini cart + product buttons
         if request.headers.get("HX-Request") == "true":
             return await render_template(
                 "_types/product/_added.html",
                 cart=g.cart,
-                item=ci,
+                item=ci_ns,
             )
 
         # normal POST: go to cart page
diff --git a/market/scrape/auth.py b/market/scrape/auth.py
new file mode 100644
index 0000000..d6e379a
--- /dev/null
+++ b/market/scrape/auth.py
@@ -0,0 +1,148 @@
+"""OAuth device flow authentication for the market scraper.
+
+Same flow as the artdag CLI client:
+1. Request device code from account server
+2. User approves in browser
+3. Poll for access token
+4. Save token to ~/.artdag/token.json (shared with artdag CLI)
+"""
+from __future__ import annotations
+
+import json
+import os
+import sys
+import time
+from pathlib import Path
+
+import httpx
+
+TOKEN_DIR = Path.home() / ".artdag"
+TOKEN_FILE = TOKEN_DIR / "token.json"
+
+_DEFAULT_ACCOUNT_SERVER = "https://account.rose-ash.com"
+
+
+def _get_account_server() -> str:
+    return os.getenv("ARTDAG_ACCOUNT", _DEFAULT_ACCOUNT_SERVER)
+
+
+def load_token() -> dict:
+    """Load saved token from ~/.artdag/token.json."""
+    if TOKEN_FILE.exists():
+        try:
+            with open(TOKEN_FILE) as f:
+                return json.load(f)
+        except (json.JSONDecodeError, IOError):
+            return {}
+    return {}
+
+
+def save_token(token_data: dict):
+    """Save token to ~/.artdag/token.json (mode 0600)."""
+    TOKEN_DIR.mkdir(parents=True, exist_ok=True)
+    with open(TOKEN_FILE, "w") as f:
+        json.dump(token_data, f, indent=2)
+    TOKEN_FILE.chmod(0o600)
+
+
+def get_access_token(require: bool = True) -> str | None:
+    """Return the saved access token, or None.
+
+    When *require* is True and no token is found, triggers interactive
+    device-flow login (same as ``artdag login``).
+    """
+    token = load_token().get("access_token")
+    if not token and require:
+        print("No saved token found — starting device-flow login...")
+        token_data = login()
+        token = token_data.get("access_token")
+    return token
+
+
+def auth_headers() -> dict[str, str]:
+    """Return Authorization header dict for HTTP requests."""
+    token = get_access_token(require=True)
+    return {"Authorization": f"Bearer {token}"}
+
+
+def login() -> dict:
+    """Interactive device-flow login (blocking, prints to stdout).
+
+    Returns the token data dict on success. Exits on failure.
+    """
+    account = _get_account_server()
+
+    # 1. Request device code
+    try:
+        with httpx.Client(timeout=10) as client:
+            resp = client.post(
+                f"{account}/auth/device/authorize",
+                json={"client_id": "artdag"},
+            )
+            resp.raise_for_status()
+            data = resp.json()
+    except httpx.HTTPError as e:
+        print(f"Login failed: {e}", file=sys.stderr)
+        sys.exit(1)
+
+    device_code = data["device_code"]
+    user_code = data["user_code"]
+    verification_uri = data["verification_uri"]
+    expires_in = data.get("expires_in", 900)
+    interval = data.get("interval", 5)
+
+    print("To sign in, open this URL in your browser:")
+    print(f"  {verification_uri}")
+    print(f"  and enter code:  {user_code}")
+    print()
+
+    # Try to open browser
+    try:
+        import webbrowser
+        webbrowser.open(verification_uri)
+    except Exception:
+        pass
+
+    # 2. Poll for approval
+    print("Waiting for authorization", end="", flush=True)
+    deadline = time.time() + expires_in
+
+    with httpx.Client(timeout=10) as client:
+        while time.time() < deadline:
+            time.sleep(interval)
+            print(".", end="", flush=True)
+
+            try:
+                resp = client.post(
+                    f"{account}/auth/device/token",
+                    json={"device_code": device_code, "client_id": "artdag"},
+                )
+                data = resp.json()
+            except httpx.HTTPError:
+                continue
+
+            error = data.get("error")
+            if error == "authorization_pending":
+                continue
+            elif error == "expired_token":
+                print("\nCode expired. Please try again.", file=sys.stderr)
+                sys.exit(1)
+            elif error == "access_denied":
+                print("\nAuthorization denied.", file=sys.stderr)
+                sys.exit(1)
+            elif error:
+                print(f"\nLogin failed: {error}", file=sys.stderr)
+                sys.exit(1)
+
+            # Success
+            token_data = {
+                "access_token": data["access_token"],
+                "username": data.get("username", ""),
+                "display_name": data.get("display_name", ""),
+            }
+            save_token(token_data)
+            print(f"\nLogged in as {token_data['username'] or token_data['display_name']}")
+            return token_data
+
+    print("\nTimed out waiting for authorization.", file=sys.stderr)
+    sys.exit(1)
diff --git a/market/scrape/persist_api/capture_listing.py b/market/scrape/persist_api/capture_listing.py
index 3943253..1104ec6 100644
--- a/market/scrape/persist_api/capture_listing.py
+++ b/market/scrape/persist_api/capture_listing.py
@@ -1,16 +1,16 @@
-# replace your existing upsert_product with this version
-
 import os
 import httpx
 
 from typing import List
 
+from ..auth import auth_headers
+
 async def capture_listing(
     url: str,
     items: List[str],
     total_pages: int
 ):
-    
+
     sync_url = os.getenv("CAPTURE_LISTING_URL", "http://localhost:8001/market/suma-market/api/products/listing/")
 
     async with httpx.AsyncClient(timeout=httpx.Timeout(20.0, connect=10.0)) as client:
@@ -19,7 +19,7 @@ async def capture_listing(
             "items": items,
             "total_pages": total_pages
         }
-        resp = await client.post(sync_url, json=_d)
+        resp = await client.post(sync_url, json=_d, headers=auth_headers())
     # Raise for non-2xx
     resp.raise_for_status()
     data = resp.json() if resp.content else {}
diff --git a/market/scrape/persist_api/log_product_result.py b/market/scrape/persist_api/log_product_result.py
index bf285ed..d729b3e 100644
--- a/market/scrape/persist_api/log_product_result.py
+++ b/market/scrape/persist_api/log_product_result.py
@@ -1,14 +1,14 @@
-# replace your existing upsert_product with this version
-
 import os
 import httpx
 
+from ..auth import auth_headers
+
 
 async def log_product_result(
         ok: bool,
         payload
 ):
-    
+
     sync_url = os.getenv("PRODUCT_LOG_URL", "http://localhost:8000/market/api/products/log/")
 
     async with httpx.AsyncClient(timeout=httpx.Timeout(20.0, connect=10.0)) as client:
@@ -16,7 +16,7 @@ async def log_product_result(
             "ok": ok,
             "payload": payload
         }
-        resp = await client.post(sync_url, json=_d)
+        resp = await client.post(sync_url, json=_d, headers=auth_headers())
     # Raise for non-2xx
     resp.raise_for_status()
     data = resp.json() if resp.content else {}
diff --git a/market/scrape/persist_api/save_nav.py b/market/scrape/persist_api/save_nav.py
index 3feeadb..a784d3d 100644
--- a/market/scrape/persist_api/save_nav.py
+++ b/market/scrape/persist_api/save_nav.py
@@ -1,17 +1,17 @@
-# replace your existing upsert_product with this version
-
 import os
 import httpx
 
 from typing import Dict
 
+from ..auth import auth_headers
+
 async def save_nav(
     nav: Dict,
 ):
     sync_url = os.getenv("SAVE_NAV_URL", "http://localhost:8001/market/suma-market/api/products/nav/")
 
     async with httpx.AsyncClient(timeout=httpx.Timeout(20.0, connect=10.0)) as client:
-        resp = await client.post(sync_url, json=nav)
+        resp = await client.post(sync_url, json=nav, headers=auth_headers())
     # Raise for non-2xx
     resp.raise_for_status()
     data = resp.json() if resp.content else {}
diff --git a/market/scrape/persist_api/save_subcategory_redirects.py b/market/scrape/persist_api/save_subcategory_redirects.py
index 60eba97..006b76d 100644
--- a/market/scrape/persist_api/save_subcategory_redirects.py
+++ b/market/scrape/persist_api/save_subcategory_redirects.py
@@ -3,11 +3,13 @@ import httpx
 
 from typing import Dict
 
+from ..auth import auth_headers
+
 async def save_subcategory_redirects(mapping: Dict[str, str]) -> None:
     sync_url = os.getenv("SAVE_REDIRECTS", "http://localhost:8000/market/api/products/redirects/")
 
     async with httpx.AsyncClient(timeout=httpx.Timeout(20.0, connect=10.0)) as client:
-        resp = await client.post(sync_url, json=mapping)
+        resp = await client.post(sync_url, json=mapping, headers=auth_headers())
     # Raise for non-2xx
     resp.raise_for_status()
     data = resp.json() if resp.content else {}
diff --git a/market/scrape/persist_api/upsert_product.py b/market/scrape/persist_api/upsert_product.py
index d65149a..faed1dc 100644
--- a/market/scrape/persist_api/upsert_product.py
+++ b/market/scrape/persist_api/upsert_product.py
@@ -5,6 +5,8 @@ import httpx
 
 from typing import Dict, List, Any
 
+from ..auth import auth_headers
+
 async def upsert_product(
         slug,
         href,
@@ -30,7 +32,7 @@ async def upsert_product(
 
     async def _do_call() -> Dict[str, Any]:
         async with httpx.AsyncClient(timeout=httpx.Timeout(20.0, connect=10.0)) as client:
-            resp = await client.post(sync_url, json=payload)
+            resp = await client.post(sync_url, json=payload, headers=auth_headers())
             resp.raise_for_status()
             # tolerate empty body
             if not resp.content:
diff --git a/shared/infrastructure/internal_inbox.py b/shared/infrastructure/internal_inbox.py
new file mode 100644
index 0000000..7a5ff20
--- /dev/null
+++ b/shared/infrastructure/internal_inbox.py
@@ -0,0 +1,49 @@
+"""Internal AP inbox dispatch for synchronous inter-service writes.
+
+Each service can register handlers for (activity_type, object_type) pairs.
+When an internal AP activity arrives, it is routed to the matching handler.
+
+This mirrors the federated ``dispatch_inbox_activity()`` pattern but for
+HMAC-authenticated internal service-to-service calls.
+"""
+from __future__ import annotations
+
+import logging
+from typing import Callable, Awaitable
+
+from sqlalchemy.ext.asyncio import AsyncSession
+
+log = logging.getLogger(__name__)
+
+# Registry: (activity_type, object_type) → async handler(session, body) → dict
+_internal_handlers: dict[tuple[str, str], Callable[[AsyncSession, dict], Awaitable[dict]]] = {}
+
+
+def register_internal_handler(
+    activity_type: str,
+    object_type: str,
+    handler: Callable[[AsyncSession, dict], Awaitable[dict]],
+) -> None:
+    """Register a handler for an internal AP activity type + object type pair."""
+    key = (activity_type, object_type)
+    if key in _internal_handlers:
+        log.warning("Overwriting internal handler for %s", key)
+    _internal_handlers[key] = handler
+
+
+async def dispatch_internal_activity(session: AsyncSession, body: dict) -> dict:
+    """Route an internal AP activity to the correct handler.
+
+    Returns the handler result dict. Raises ValueError for unknown types.
+    """
+    activity_type = body.get("type", "")
+    obj = body.get("object") or {}
+    object_type = obj.get("type", "") if isinstance(obj, dict) else ""
+
+    key = (activity_type, object_type)
+    handler = _internal_handlers.get(key)
+    if handler is None:
+        raise ValueError(f"No internal handler for {key}")
+
+    log.info("Dispatching internal activity %s", key)
+    return await handler(session, body)
diff --git a/shared/infrastructure/internal_inbox_client.py b/shared/infrastructure/internal_inbox_client.py
new file mode 100644
index 0000000..8b36d4c
--- /dev/null
+++ b/shared/infrastructure/internal_inbox_client.py
@@ -0,0 +1,84 @@
+"""Client for sending internal AP activities to other services.
+
+Replaces ``call_action`` for AP-shaped inter-service writes.
+Uses the same HMAC authentication as actions/data clients.
+"""
+from __future__ import annotations
+
+import logging
+import os
+
+import httpx
+
+from shared.infrastructure.internal_auth import sign_internal_headers
+
+log = logging.getLogger(__name__)
+
+_client: httpx.AsyncClient | None = None
+
+_DEFAULT_TIMEOUT = 5.0
+
+INBOX_HEADER = "X-Internal-Inbox"
+
+
+class InboxError(Exception):
+    """Raised when an internal inbox call fails."""
+
+    def __init__(self, message: str, status_code: int = 500, detail: dict | None = None):
+        super().__init__(message)
+        self.status_code = status_code
+        self.detail = detail
+
+
+def _get_client() -> httpx.AsyncClient:
+    global _client
+    if _client is None or _client.is_closed:
+        _client = httpx.AsyncClient(
+            timeout=httpx.Timeout(_DEFAULT_TIMEOUT),
+            follow_redirects=False,
+        )
+    return _client
+
+
+def _internal_url(app_name: str) -> str:
+    env_key = f"INTERNAL_URL_{app_name.upper()}"
+    return os.getenv(env_key, f"http://{app_name}:8000").rstrip("/")
+
+
+async def send_internal_activity(
+    app_name: str,
+    activity: dict,
+    *,
+    timeout: float = _DEFAULT_TIMEOUT,
+) -> dict:
+    """POST an AP activity to the target service's /internal/inbox.
+
+    Returns the parsed JSON response on 2xx.
+    Raises ``InboxError`` on network errors or non-2xx responses.
+    """
+    base = _internal_url(app_name)
+    url = f"{base}/internal/inbox"
+    try:
+        headers = {INBOX_HEADER: "1", **sign_internal_headers(app_name)}
+        resp = await _get_client().post(
+            url,
+            json=activity,
+            headers=headers,
+            timeout=timeout,
+        )
+        if 200 <= resp.status_code < 300:
+            return resp.json()
+        msg = f"Inbox {app_name} returned {resp.status_code}"
+        detail = None
+        try:
+            detail = resp.json()
+        except Exception:
+            pass
+        log.error(msg)
+        raise InboxError(msg, status_code=resp.status_code, detail=detail)
+    except InboxError:
+        raise
+    except Exception as exc:
+        msg = f"Inbox {app_name} failed: {exc}"
+        log.error(msg)
+        raise InboxError(msg) from exc
diff --git a/shared/models/market.py b/shared/models/market.py
index 9c68c20..587632a 100644
--- a/shared/models/market.py
+++ b/shared/models/market.py
@@ -410,19 +410,18 @@ class CartItem(Base):
         nullable=True,
     )
 
-    # Cross-domain relationships — explicit join, viewonly (no FK constraint)
-    market_place: Mapped["MarketPlace | None"] = relationship(
-        "MarketPlace",
-        primaryjoin="CartItem.market_place_id == MarketPlace.id",
-        foreign_keys="[CartItem.market_place_id]",
-        viewonly=True,
-    )
-    product: Mapped["Product"] = relationship(
-        "Product",
-        primaryjoin="CartItem.product_id == Product.id",
-        foreign_keys="[CartItem.product_id]",
-        viewonly=True,
-    )
+    # Denormalized product data (snapshotted at write time)
+    product_title: Mapped[str | None] = mapped_column(String(512), nullable=True)
+    product_slug: Mapped[str | None] = mapped_column(String(512), nullable=True)
+    product_image: Mapped[str | None] = mapped_column(Text, nullable=True)
+    product_brand: Mapped[str | None] = mapped_column(String(255), nullable=True)
+    product_regular_price: Mapped[float | None] = mapped_column(Numeric(12, 2), nullable=True)
+    product_special_price: Mapped[float | None] = mapped_column(Numeric(12, 2), nullable=True)
+    product_price_currency: Mapped[str | None] = mapped_column(String(16), nullable=True)
+
+    # Denormalized marketplace data (snapshotted at write time)
+    market_place_name: Mapped[str | None] = mapped_column(String(255), nullable=True)
+    market_place_container_id: Mapped[int | None] = mapped_column(Integer, nullable=True)
 
     __table_args__ = (
         Index("ix_cart_items_user_product", "user_id", "product_id"),
diff --git a/shared/models/order.py b/shared/models/order.py
index 1fda0f7..04814ad 100644
--- a/shared/models/order.py
+++ b/shared/models/order.py
@@ -87,6 +87,8 @@ class OrderItem(Base):
         nullable=False,
     )
     product_title: Mapped[Optional[str]] = mapped_column(String(512), nullable=True)
+    product_slug: Mapped[Optional[str]] = mapped_column(String(512), nullable=True)
+    product_image: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
 
     quantity: Mapped[int] = mapped_column(Integer, nullable=False, default=1)
     unit_price: Mapped[float] = mapped_column(Numeric(12, 2), nullable=False)
@@ -102,12 +104,3 @@ class OrderItem(Base):
         "Order",
         back_populates="items",
     )
-
-    # Cross-domain relationship — explicit join, viewonly (no FK constraint)
-    product: Mapped["Product"] = relationship(
-        "Product",
-        primaryjoin="OrderItem.product_id == Product.id",
-        foreign_keys="[OrderItem.product_id]",
-        viewonly=True,
-        lazy="selectin",
-    )